An Experimental Study On Characteristics of Flame and Combustion Stability of Coaxial Jet Injectors

Son, Jinwoo; Min, Yong Ho; Sohn, Chae Hoon

doi:10.15231/jksc.2016.21.2.015

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2019

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“…Lots of previous studies show that the injector is one of key elements and has great impact on combustion instability [6,7]. And, gas-centered swirl coaxial (GCSC) injector is used typically in a liquid rocket engine adopting staged combustion cycle [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Study on Factors Affecting Combustion Characteristics of GCSC Injector

Wang¹,

Son²,

Sohn³

2019

jksc

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Factors affecting the combustion characteristics of gas-centered swirl coaxial (GCSC) injectors are investigated numerically and experimentally. The factors are fuel volume flow rate (Q f), momentum flux ratio (MFR) and oxidizer/fuel (O/F) ratio. Firstly, the flame pattern becomes asymmetric as the fuel volume flow rate increases with a fixed momentum flux ratio. Then, the suitable fuel volume flow rate is selected according to the results. Next, the momentum flux ratio is increased by increasing the oxidizer volume flow rate (Q o) with a fixed fuel volume flow rate. Results show that the spreading angle decreases as momentum flux ratio increases, which agrees with our previous results. Finally, in order to check effects of oxidizer/fuel ratio, the Q f , Q o , and MFR are kept the same but the O 2 mole fraction of oxidizer is changed. From numerical and experimental results, it is found that flame pattern depends on oxidizer/fuel ratio and spreading angle increases as the O 2 mole fraction decreases.

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Section: Introductionmentioning

confidence: 99%